Vent-regulator for pneumatic actions.



M. CLARK. VENT REGULATOVRFOR PNEUMATIC ACTIONS.

APPLIGATIONIIILBD JAN. 5, 1914.

1,1 32,650. Patented Mar. 23, 1915.

I 7 II 1 I ia I J I I I I I I I l I I I I I I I. I I I I I I I I I I I II I I I I 3 I I I I I v I I I l I I I I I I 4 I I I l I I I I I L I Z I2 2 3 3 a a 7 9 I I f 2 3 8 w 5 7 8 J y ag- M I UNITED STATES PATENTOFFICE.

MELVILLE CLARK, OF CHICAGO, ILLINOIS, ASSIGNOR TO MELVILLE CLARK PIANOCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

VENT-REGULATOR FOR PNEUMATIC ACTIONS.

Application filed January 5, 1914.

To all whom it may concern:

Be it known that I, MELVILLE CLARK, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented new and useful Improvements in Vent-Regulators for PneumaticActions, of which the following is a specification, reference being hadto the accompanying drawings, forming a part thereof.

The purpose of this invention is to provide an improved device forregulating the vent or primary bleeder of a pneumatic action.

It consists in the elements and features of construction shown anddescribed as indicated in the claims.

In the drawings: Figure 1 is a detail front elevation of a portion ofthe exhaust chamber of a pneumatic action having its primaries equippedwith this invention, the removable cover strip in front of theregulators being partly broken away so as to disclose them. Fig. 2 is avertical section at the line 22 on Fig. 1. Fig. 3 is a detail section atthe line, 3,-3, on Fig. 2.

This invention is in the drawings shown applied to a familiar form ofpneumatic action, in which 1 is the main exhaust chamber containing theprimary pneumatics, 2, each of which is mounted upon a duct bar orstick, 3, these duct bars being fixed within the chamber, 1, the upperend of each being connected to a tube, 5, leading to the tracker notshown. For the purpose of venting the primary pneumatic, by what iscommonly called the bleeder, and adapting it for convenient positioningof an adjusting device, a cross port, 7, is formed in each of the ductbars, 3, leading from one of the lateral surfaces of the bar into theduct, 3 which connects with the primary pneumatic; and from the forwardsurface of the bar, a hole, 8, is drilled transversely into the crossport. Into this hole, 8, there is set a screw, 9, preferably having itsend spheroidal, the head of the screw being exposed at the forward sideof the bar so that it can be screwed in Specification of Letters Patent.

Patented Mar. 23, 1915.

Serial No. 810,300.

and out to cause it to obstruct more or less the cross port, 7. By thisarrangement, it will be seen that easy access is obtainable to all theadjusting screws, 9, for regulating the vent of all the primarypneumatics, and that the duct bars, 3, being of hard wood, and thescrews 9, being tightly fitted into the bores, 8, and made to cut theirown thread when they are screwed into these bores, the adjustment issecure against accidental change.

I claim 1. In a pneumatic action, in combination with an exhaustchamber, a duct bar sustained wholly within such chamber having an airduct for connection with a primary pneumatic to be contained within thecham ber and having a cross port leading to the air duct from onesurface of said bar which is exposed within said chamber, and a screwset into the bar transversely of said cross port and having its headexposed for adjustment to vary the extent of its intrusion into thecross port.

2. In a pneumatic action, in combination with the exhaust chamber, ductbars mounted within said chamber having air ducts for communication withthe primary pneumatics, and primary pneumatics connected with said ductbars respectively, the duct bars having each a cross port leading from alateral surface of the bar which is exposed within the chamber into theair duct; an adjusting screw set into each bar transversely of the crossport from the side of the bar which faces toward the outer wall of thechamber, said outer wall having a removable cover plate whose removalexposes the heads of the adjusting screws for adjustment to vary theextent of their intrusion into the cross ports respectively.

In testimony whereof, I have hereunto set my hand at Chicago, Illinois,this 29th day of December, 1913.

MELVILLE CLARK.

WVitnesses:

LUCY I. STONE, M. GERTRUDE ADY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

